component-tween/examples/circle.html

Motion tween engine using 'ease'

<style>
  canvas {
    border: 1px solid #eee;
  }
</style>

<script src="../build/build.js"></script>

<canvas width=500 height=400></canvas>

<button onclick='tween.stop()'>Stop</button>

<script>
  var Tween = require('tween');
  var raf = require('component-raf');
  var canvas = document.querySelector('canvas');
  var ctx = canvas.getContext('2d');

  var tween = Tween({ alpha: 0, border: 1, radius: 1 })
    .ease('out-bounce')
    .to({ alpha: 1, border: 15, radius: 150  })
    .duration(1000);

  tween.update(function(o){
    canvas.width = canvas.width;
    ctx.strokeStyle = 'black';
    ctx.globalAlpha = o.alpha;
    ctx.lineWidth = o.border;
    ctx.arc(canvas.width / 2, canvas.height / 2, o.radius, 0, Math.PI * 2, false);
    ctx.stroke();
    ctx.fill();
  });

  tween.on('end', function(){
    animate = function(){};
  });

  function animate() {
    raf(animate);
    tween.update();
  }

  animate();
</script>